Add "jump to current event" button to events schedule

[Edge7481]

Pivotal Tracker Link

What this PR does:

This PR adds a "jump to current event" button on the schedules page to scroll to the event closest to the the current time

Include screenshots, videos, etc.

Who authored this PR?

How should this PR be tested?

• Is there a deploy we can view?
• What do the specs/features test?

I added a test that checks that the current event is correctly highlighted

• Are there edge cases to watch out for?

Since javascript is incompatible with Timecop, I had to unfreeze timecop and use the actual real life time to test this feature.

Are there any complications to deploying this?

Checklist:

• [x] Has this been deployed to a staging environment or reviewed by a customer?
• [x] Tag someone for code review (either a coach / team member)
• [x] I have renamed the branch to match PivotTracker's suggested one (necessary for BlueJay)